122012012021 has 4 divisors (see below), whose sum is σ = 122044149612. Its totient is φ = 121979874432.

The previous prime is 122012011997. The next prime is 122012012081. The reversal of 122012012021 is 120210210221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 66131779921 + 55880232100 = 257161^2 + 236390^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-122012012021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 122012011987 and 122012012005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122012012081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16063100 + ... + 16070693.

It is an arithmetic number, because the mean of its divisors is an integer number (30511037403).

Almost surely, 2^122012012021 is an apocalyptic number.

It is an amenable number.

122012012021 is a deficient number, since it is larger than the sum of its proper divisors (32137591).

122012012021 is an equidigital number, since it uses as much as digits as its factorization.

122012012021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32137590.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 122012012021 its reverse (120210210221), we get a palindrome (242222222242).

The spelling of 122012012021 in words is "one hundred twenty-two billion, twelve million, twelve thousand, twenty-one".